# Data Engineer Cert Prep vs Wonder

The clearest difference is update cadence: Wonder at every 6 months against Data Engineer Cert Prep's every 13 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Data Engineer Cert Prep ships an update every 13 months, Wonder every 6 months. The most recent releases landed on October 1, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | Data Engineer Cert Prep | Wonder |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 13 months | **Every 6 months** |
| Size | 1 MB | 32 MB |
| Requires iOS | 16.0 | **15.1** |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Age rating | 4+ | 9+ |
| Developer | [DjamgaTech Corp](https://appshunter.io/developer/969000181) | [Gentiana Etemi](https://appshunter.io/developer/1883027493) |

## What reviewers say

### Data Engineer Cert Prep

[App page](https://appshunter.io/ios/app/data-engineer-cert-prep/id6566170013)

**Features:** Vision Pro support

**In-app purchases:** none


### Wonder

[App page](https://appshunter.io/ios/app/wonder-facts/id6762163666)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Data Engineer Cert Prep free?

Data Engineer Cert Prep is free to download, with no in-app purchases.

### Is Wonder free?

Wonder is free to download, with no in-app purchases.

### Do Data Engineer Cert Prep or Wonder have ads?

Neither Data Engineer Cert Prep nor Wonder shows ads.

### Which is updated more often, Data Engineer Cert Prep or Wonder?

Data Engineer Cert Prep ships an update every 13 months, and Wonder every 6 months. Most recently, Data Engineer Cert Prep was updated on October 1, 2026 and Wonder on October 11, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*